四年级下册 运算律（笔算）
姓名：_______________
学号：_______________
用时：_______________
| 7 + 42 + 49 = (7 + __) + 49 | 99 × 5 = 100 × 5 - __ × 5 |
| 51 + 20 = 20 + __ | 44 + 10 + 30 = (44 + __) + 30 |
| (8 + 7) × 4 = 32 + __ | (1 + 3) × 9 = 9 + __ |
| 61 + 69 = 69 + __ | 7 + 6 + 21 = (7 + __) + 21 |
| 37 + 23 + 38 = (37 + __) + 38 | 90 × 4 = 4 × __ |
| 22 + 3 + 46 = (22 + __) + 46 | 97 × 8 = 8 × __ |
| 52 × 4 = 4 × __ | 99 × 3 = (100 - __) × 3 |
| (16 + 5) × 5 = 80 + __ | 95 × 6 = (100 - __) × 6 |
| 89 + 90 = 90 + __ | 72 × 9 = 9 × __ |
| 39 + 30 + 27 = (39 + __) + 27 | 20 + 36 = 36 + __ |
| (15 + 19) × 6 = 90 + __ | 18 + 4 + 7 = (18 + __) + 7 |
| 97 × 2 = (100 - __) × 2 | 96 × 8 = 100 × 8 - __ × 8 |
| 26 + 89 = 89 + __ | (18 + 9) × 4 = 72 + __ |
| 48 + 33 + 1 = (48 + __) + 1 | 99 × 4 = 100 × 4 - __ × 4 |
| (15 + 5) × 2 = 30 + __ | 97 × 7 = (100 - __) × 7 |
| 10 × 6 = 6 × __ | 31 + 42 = 42 + __ |
| (5 + 17) × 4 = 20 + __ | 92 + 50 = 50 + __ |
| (15 + 15) × 4 = 60 + __ | 98 × 9 = 100 × 9 - __ × 9 |
四年级下册 运算律（笔算）（答案）
姓名：_______________
学号：_______________
用时：_______________
| 7 + 42 + 49 = (7 + __) + 49 42 | 99 × 5 = 100 × 5 - __ × 5 1 |
| 51 + 20 = 20 + __ 51 | 44 + 10 + 30 = (44 + __) + 30 10 |
| (8 + 7) × 4 = 32 + __ 28 | (1 + 3) × 9 = 9 + __ 27 |
| 61 + 69 = 69 + __ 61 | 7 + 6 + 21 = (7 + __) + 21 6 |
| 37 + 23 + 38 = (37 + __) + 38 23 | 90 × 4 = 4 × __ 90 |
| 22 + 3 + 46 = (22 + __) + 46 3 | 97 × 8 = 8 × __ 97 |
| 52 × 4 = 4 × __ 52 | 99 × 3 = (100 - __) × 3 1 |
| (16 + 5) × 5 = 80 + __ 25 | 95 × 6 = (100 - __) × 6 5 |
| 89 + 90 = 90 + __ 89 | 72 × 9 = 9 × __ 72 |
| 39 + 30 + 27 = (39 + __) + 27 30 | 20 + 36 = 36 + __ 20 |
| (15 + 19) × 6 = 90 + __ 114 | 18 + 4 + 7 = (18 + __) + 7 4 |
| 97 × 2 = (100 - __) × 2 3 | 96 × 8 = 100 × 8 - __ × 8 4 |
| 26 + 89 = 89 + __ 26 | (18 + 9) × 4 = 72 + __ 36 |
| 48 + 33 + 1 = (48 + __) + 1 33 | 99 × 4 = 100 × 4 - __ × 4 1 |
| (15 + 5) × 2 = 30 + __ 10 | 97 × 7 = (100 - __) × 7 3 |
| 10 × 6 = 6 × __ 10 | 31 + 42 = 42 + __ 31 |
| (5 + 17) × 4 = 20 + __ 68 | 92 + 50 = 50 + __ 92 |
| (15 + 15) × 4 = 60 + __ 60 | 98 × 9 = 100 × 9 - __ × 9 2 |